JPH03158137A - Magnetic resonance imaging device - Google Patents

Abstract

PURPOSE:To improve diagnosing capacity by a method wherein anatomical information is added to a blood portion picture. CONSTITUTION:A high frequency magnetic field by means of which nuclear magnetic resonance phenomenon is created is generated at a body 102 to be inspected in a magnetostatic field, generated by a magnet 101, by a transmitting receiving system 106 to irradiate the body 102 to be inspected by means of a transmitting coil 104. After the lapse of a specified time, the magnetic resonance signal generated by the body to be inspected is detected by a receiving coil 105 to convert the signal into an audio frequency by means of the transmitting receiving system 106. After the audio signal is converted into a digital signal by means of an A/D converter 107, necessary picture reforming computing processing is applied on the digital signal by a calculator 109 to display a result by a display device 110. An inclined magnetic field for adding necessary information and velocity of flow information to imaging is applied by means of an inclined magnetic field coil 103 driven by an inclined magnetic field source 108 controlled by the calculator 109. A picture 130 in which an obtained normal fault picture is superposed with a blood vessel picture is produced and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display method for improving the diagnostic ability of a magnetic resonance imaging apparatus.

[Prior art]

Conventionally, a normal tomographic image was obtained or an image of only the blood vessel was displayed separately.

[Problem to be solved by the invention]

Since the above-mentioned conventional technology displays a normal tomographic image and a blood vessel image separately, it has the disadvantage that the anatomical three-dimensional position cannot be seen in the blood vessel site image. Diagnostic ability is improved by adding additional information.

〔Example〕

An embodiment of the present invention will be shown below. FIG. 1 shows an outline of the configuration of the magnetic resonance imaging apparatus. A subject 102 is placed in a magnet 101 that generates a uniform static magnetic field, and a transmitting/receiving system 106 generates a high-frequency magnetic field necessary to cause a nuclear magnetic resonance phenomenon to hydrogen nuclei in the subject. from the transmitting coil 104 to the subject 102
irradiate against. After a certain period of time, the magnetic resonance signal generated by hydrogen nuclei in the subject is detected by the receiving coil 105, and the detected resonance signal is transmitted to the transmitting/receiving system 1.
06 to an audible frequency.

Further, the signal is converted into a digital signal by an A/D converter 107. The digital signal is subjected to necessary image reconstruction calculation processing by the computer 109, and the obtained image is displayed on the display device 1.
110. Further, a gradient magnetic field for adding position information and flow velocity information necessary for imaging is generated by a gradient magnetic field power supply 108 controlled by a computer 109 so as to satisfy predetermined necessary conditions, and a gradient magnetic field driven by the power supply. Applied by coil 103. Also,
The transmitting/receiving system 106 is also controlled by a similar computer.

FIG. 2 shows an example of the control flow (sequence) of the gradient magnetic field coil and the transmitting/receiving system for obtaining a normal image. A tomographic image 120 is obtained by performing 2D-FFT processing on the obtained signal.

FIG. 3 shows an example of a sequence for obtaining blood vessel images. A blood vessel image 121 is obtained by subjecting two images obtained from each of the two sequences shown in FIG. 3 to subtraction.

An image 130 in which the normal tomographic image obtained in this manner and the blood vessel image are superimposed is created and displayed.

At this time, the signal intensity ratio of the normal tomographic image and the blood vessel image is set to 1:
It may be changed from 1 as appropriate.

〔Effect of the invention〕

According to the present invention, anatomical information contained in a normal tomographic image and the course of blood vessels can be read at the same time. Therefore, the anatomical position of the blood vessel of interest becomes clear and diagnostic ability is improved.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the magnetic resonance apparatus, Figure 2 is a diagram showing the sequence for obtaining normal tomographic images, Figure 3 is a diagram showing the sequence for acquiring blood vessel images, and Figure 4 is a diagram showing the sequence for obtaining normal tomographic images. FIG. 5 is a diagram showing a blood vessel image, and FIG. 6 is a diagram showing a display example according to the present invention. 101... Magnet, 102... Subject, field coil, 1
04... Transmission coil, illumination, 106... Transmission/reception system, converter, 108... Gradient magnetic field power supply, 110... Display device. 103...Gradient magnetic field 105...Receiver 107...A/D 109...Computer, first factor

Claims (1)

[Claims] 1. A high frequency generator for applying a high frequency magnetic field to cause a nuclear magnetic resonance phenomenon to a subject placed in a static magnetic field, the high frequency irradiation coil, and the resonance signal from the sample that caused the nuclear magnetic resonance. A receiving coil for receiving the signal, a receiving device for amplifying and detecting the received signal and converting it to an audible frequency, a calculator for capturing and processing the output of the receiving device as data, and image reconstruction processing using the calculator. A display device for performing the processing and displaying the results, and for selectively causing the nuclear magnetic resonance phenomenon based on the difference in spatial position, or for reflecting the difference in spatial position in the frequency or phase of the resonance signal. A magnetic resonance imaging apparatus comprising a gradient magnetic field generator and a gradient magnetic field coil that generate magnetic fields with different strengths depending on spatial positions.